Data Communication System and Data Transmitting Apparatus

a data communication and data technology, applied in the field of data communication systems and data transmitting apparatuses, can solve problems such as limited noise immunity, and achieve the effect of improving noise immunity

Inactive Publication Date: 2008-08-14
SUEHIRO NAOKI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0079]According to an embodiment of the present invention, it is possible to provide a d

Problems solved by technology

Although the OFDM system is efficient, it has limited noise immunity, pa

Method used

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  • Data Communication System and Data Transmitting Apparatus
  • Data Communication System and Data Transmitting Apparatus
  • Data Communication System and Data Transmitting Apparatus

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Embodiment Construction

Description of Notations

[0097]31, 81, 91 orthogonal transforming unit[0098]82, 82, 92 signal transforming unit[0099]33, 85, 95 signal inverse-transforming unit[0100]34, 86, 96 orthogonal inverse-transforming unit[0101]41, 71, 72 Hadamard transforming unit[0102]42, 55 P / S conversion unit[0103]43 ZCZ transforming unit[0104]44, 83, 93 transmitting unit[0105]51, 84, 94 receiving unit[0106]52 ZCZ inverse-transforming unit[0107]53 S / P conversion unit[0108]54 Hadamard inverse-transforming unit[0109]97 transmission scheme switching unit[0110]98 transmission condition detecting unit[0111]99 switch signal detecting unit

BEST MODE OF CARRYING OUT THE INVENTION

[0112]With reference to FIG. 5, the principle of the present invention is described. The system shown in FIG. 5 includes an orthogonal transforming unit 31, a signal transforming unit (for example, OFDM, ZCZ) 32, a signal inverse-transforming unit 33, and an orthogonal inverse-transforming unit 34.

[0113]The orghogonal transforming unit 31 ...

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Abstract

A data communication system and a data transmitting apparatus with improved noise immunity are disclosed. The data communication system includes an orthogonal transforming unit using an N times N orthogonal matrix; a signal transforming unit; a transmitting unit; a receiving unit; a signal inverse-transforming unit; and an orthogonal inverse-transforming unit.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a data communication system and a data transmitting apparatus including an orthogonal transforming unit.[0003]2. Description of the Related Art[0004]OFDM (Orthogonal Frequency Division Multiplexing) is used for reasons of the resistance to frequency selective fading, the tolerance to narrowband interference, the high efficiency of frequencies, and easy processing in the frequency domain.[0005]FIG. 1(A) shows a transmitting apparatus 10 which includes an S / P (serial / parallel) conversion unit 11, a subcarrier modulation unit 12, an IDFT (Inverse Discrete Fourier Transform) unit 13, a prepseudo-periodic part inserting unit 14, a transmitting unit 15, an oscillator 16, and an antenna 17. The prepseudo-periodic part inserting unit 14 is generally referred to as a guard interval inserting unit.[0006]Transmission data (for example, a digital information sequence) is converted into parallel sign...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B1/707H04J13/22
CPCH04J13/0011H04L27/2602H04J13/0055H04L27/26035
Inventor SUEHIRO, NAOKI
Owner SUEHIRO NAOKI
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